Time Code Exercise

add_time_code_exercise.rb

class TimeMethods
  # [H]H:MM {AM|PM} -> 9:13 AM
  def add_time(time, minutes)
    validate_minutes(minutes)

    parsed_time = parse_time(time)
    
    
    
    minutes_added = parsed_time[:minutes] + minutes
    parsed_time[:minutes] = minutes_added % 60
    parsed_time[:hour] += 1 if minutes_added > 60

    if parsed_time[:hour] == 12
      periods = ['AM', 'PM']
      periods.delete(parsed_time[:period])
      parsed_time[:period] = periods.first
    end

    puts format_time(*parsed_time.values_at(:hour, :minutes, :period))
  end

  private

  def parse_time time
    period = time.slice!(-2..-1)
    hour, minutes = time.strip.split(':')
    total_minutes = (hour.to_i * 60) + minutes.to_i
    parsed_time = {
      hour: hour.to_i,
      minutes: minutes.to_i,
      period: period,
      total_minutes: total_minutes
    }
  end

  def format_time(hour, minutes, period)
    "#{hour}:#{format_minutes(minutes)} #{period.upcase}"
  end

  def format_minutes minutes
    minutes.to_s.length == 1 ? "0#{minutes}" : minutes
  end

  def validate_minutes minutes
    # Wouldn't do this in real world, but wanted to limit total time spent
    if minutes < 0
      raise 'Cannot deduct time, please enter a positive integer.'
    elsif minutes > 60
      raise 'Cannot add more than 60 minutes, because internet.'
    end
  end
end

TimeMethods.new.add_time("9:13 AM", 10)   # Expected: 9:23 AM
TimeMethods.new.add_time("11:53 AM", 25)  # Expected: 12:18 PM
TimeMethods.new.add_time("9:13 AM", 60)   # Expected: 10:13 AM

## For testing validations
# TimeMethods.new.add_time("9:13 AM", -10)   # Expected: raise error
# TimeMethods.new.add_time("9:13 AM", 120)   # Expected: raise error

test.md

This is a test for Markdown

Pretty cool what I can do.